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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Brass to .340 Weatherby Brass Conversion Question
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<blockquote data-quote="Wild_Bill" data-source="post: 2027272" data-attributes="member: 4785"><p>Ok i will answer</p><p>Size the 375 cases in your 340 FLS die as you do this dont size so the shell holder touches the die slowly size 1 case at a time until a case will just close with slight feel on the shoulder. This will help the cases form without creating a stretched case. If you have an annealer then anneal if you want to it is not critical then trim to max 340 cas length if required. Next seat a projectile in a case and measure the loaded neck diameter. Now measure your reamer and make sure you have at least .003" clearence if it is tighter than this neck turn dont ream, reaming is really concentric and can give irratic release of the projectile. Now you have sized cases that fit in your rifle look for a starting 375 load with a slow powder that matches your 338 projecile weight and compare that to a 340 starting load, use the one that is the lightest.</p><p>Fire form the cases.</p><p>After fire forming full length size your cases and trim to trim length however forget that they have a belt. Size them like a 270 etc by only bumping the shoulder back .002" use hornady shoulder comparator to measure that. You can anneal between firings if you wish to it should extend your brass life. Now you have to work slowly up from your forming load to a max load in your rifle. You might find it matches the max data in the loading manual but it might also be less depending on the fireformed brass volume and your match chamber dimensions.</p><p></p><p>Full length size everything but use compartors to know when they are sized to the minimum required that will help you obtain maximum brass life.</p></blockquote><p></p>
[QUOTE="Wild_Bill, post: 2027272, member: 4785"] Ok i will answer Size the 375 cases in your 340 FLS die as you do this dont size so the shell holder touches the die slowly size 1 case at a time until a case will just close with slight feel on the shoulder. This will help the cases form without creating a stretched case. If you have an annealer then anneal if you want to it is not critical then trim to max 340 cas length if required. Next seat a projectile in a case and measure the loaded neck diameter. Now measure your reamer and make sure you have at least .003" clearence if it is tighter than this neck turn dont ream, reaming is really concentric and can give irratic release of the projectile. Now you have sized cases that fit in your rifle look for a starting 375 load with a slow powder that matches your 338 projecile weight and compare that to a 340 starting load, use the one that is the lightest. Fire form the cases. After fire forming full length size your cases and trim to trim length however forget that they have a belt. Size them like a 270 etc by only bumping the shoulder back .002" use hornady shoulder comparator to measure that. You can anneal between firings if you wish to it should extend your brass life. Now you have to work slowly up from your forming load to a max load in your rifle. You might find it matches the max data in the loading manual but it might also be less depending on the fireformed brass volume and your match chamber dimensions. Full length size everything but use compartors to know when they are sized to the minimum required that will help you obtain maximum brass life. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H Brass to .340 Weatherby Brass Conversion Question
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